CLEANING : 

    ALUMINIUM  ACID DEGREASER 

For aluminium pretreatment ,  normally we clean in mild alkaline cleaner then do etching in the alkaline etchant , then we do further treatment for electroplating ,anodizing , chromatising  etc .

For chromatising purpose , now we can use the acid degreaser which will clean the parts and do mild etching also. By doing this we can avoid the alkaline mild etching and nitric acid dip , which will save chemicals ,  water, labour  and in acid degreaser process there will be no fumes like sodium hydroxide fumes in alkaline etchant . This acid degreaser will be good for shop floor compare to alkaline etchant .

  Process Sequence of Chromating :

1.   Acid Degreasing  :  Concentration : 50 ml/litre , time : 3 – 10 min , Ambient temperature

2.   Water rinse

3.   Water rinse

4.   Passivation

5.   Water rinse

6.   Water rinse

7.   Dry